Crushing-mill.



T J.' STURTEVANT.

GRUSHING MILL.

APILIGATION FILED Nov. 1o, 1911.

Patented Dec. 29, `1914.

2 SHEETS-SHEET 2.

" UNITED STATES PATENT FFCE.'

THOMAS JOSEPH STURTEVANT, OF WELLESLEY, MASSACHUSETTS, ASSIGNOR '10 iSTURTEVAYNT MILL COMPANY, A CORPORATION 0F MAINE.

lon'U'snnvo ivrILL.

Patenten nee. sa, 191e.

application med November 1o, 1911. serial No. 659,561.

To all whom it may concern:

Be it known that I,- THoMAs J. STURTE- vAN'r, a citizen of the UnitedStates, residing at Welleslev, lin thelcounty' of Norfolkv and State ofMassachusetts, have invented or discovered certain new and usefullmp'ro'vemen'ts lin Crushing-Mills, of which the capacity, and whichwillrbe more evenly balanced, so that it will run smoothly and will besubject to less strain, than the mills shown and described in saidpatents.

The present improved mill comprises a base provided with suitablestandards in which are journaled a single rotating shaft to the oppositeends of which are mounted carriers for rotating anvil rings inclosed incasings at the opposite ends of the said base. Cooperating with each ofthe anvil rings referred to' are spring-pressed crushing rolls which aremounted on heads or doors constituting casing parts and closing the endsof the two casings 'referred to. he material to be crushed is suppliedto the anvil rings from suitable hoppers mounted on the casing parts,and from which hoppers extend feed spouts to convey the materialto becrushed to the said anvil rings. It will thus be understood that thepresent improvement provides a. duplex ring-roll crushing-mill which maybe built at a cost very much less thanthe cost of two mills would be,while providing a mill occupying much less sace than would be occupiedby two mills o equal capacity. This duplex mill ,can be driven atconsiderably less power than would be required to drive two mills ofequal capacity. n addition to these advantages the present improvementprovides a mill which 1s evenly balanced, as no single mill could be, inthat, when running, the end thrust of one head or anvil ring carrierbalances the end thrust of the other head 'or carrier; and the weight ofone head or carrier balances the weight of the other.

In the accompanying drawings Figure 1 1s a side view, partly in verticalsection, ot'

a mill embodving the present invention, and

F1a'. 2 is an end view thereof. l

Referring to the drawings, 12 denotes th@ 'base of the mill which isprovided with each 'of the said carriers is secured,in any suitablemanner, an anvil ring 17 arranged to rotate' in a vertical plane. Thecasings 15 are closed at their ends by doors or heads 18 preferably madein the form of swinging doors hinged on posts 19 mounted on' the base12, this open-door construction being similar to that shown anddescribed 1n U. S. Patent No. 995,580 hereinbefore referred to.Pivotally supported on the end heads or doors 18 are a series ofcrushing roll carriers 20 from which are supported the crushing rolls21. The crushing roll carriers are provided with bearing pins orstub-shafts 22 on which rotate sleeves 23 to which the said crushingrolls 21 are secured. Any desired number of crushing rolls, from one tothree or more, may be employed in coperation with each anvil ring. Inthe mill herein shown three crushing rolls are provided to coperate witheach anvil ring. The crushing rolls are yieldingly forced to ward theinner face of the anvil rings 17 by means of springs 24 acting onthreearmed brackets or spiders 25 attached to said end heads 18by meansof bolts 2G provided With suitable nuts or Washers and encircled bythesaid springs 24. The brackets or spiders 25 are each provided with a cene tral pressure-pin or screw 27 acting on a pressure plate 28 which in'.turn engages blocks 29 between which and similar blocks 30 011" thepivotrd crushing roll carriers 20 are preferably interposedanti-friction balls 31. By lvirtue of this construction the pressure ofthe several springs 24 is evenly distributedl to the' several crushingroll supports or carriers 20, as. in the machine of Patent No. 995,580,herevnbefore referred to..;t10

mamme @i mounted rolls, when in operation, having a scuilingaction onsaid anvil rings" and which scuiing action produces more or less endthrust on said shaft, such end thrust being balanced by the duplicatedanvil rings and cooperating yieldingly-mounted crushing rolls at theOpposite'eds of said shaft.

In a ring-roll crushing mill, the combination with a base provided withstandards7 of a driving shaftjournaled in said standards, casing ypartsmounted at the opposite ends of said base, anvil-ring carriers securedto the opposite ends of said shaft and balancing each other as toWeight, an anvil ring attached to each of .said carriers, a plurality ofspring-pressed crushing rolls cooperating with each of said anvil rings,heads for closing the ends of said easing parts, vbearmg pins or stubsbaftsvsupported on said heads and on which' able eoperating parts thepressure et' a set of said springs is evenly distributed to a set ofcrushing-roll carriers; the conjoint action of said rings and rollsproducing end thrust on said shaft, and which end thrust is balanced bythe duplicated 'crushing 1nechanisms at the opposite ends oi' saidshaft.

In testimony whereof I a'iX my signature,

in presence of two Witnesses.

THMAS JOSEPH STURTEVNT. -Witnesses L. H. STo-RTEVANT, W. H. Emis.

